Statistical analysis
The data are expressed as the mean ± standard deviation. ANOVAs in the
form of Newman-Keuls tests were used to compare the means of continuous
variables among groups, and any significant difference was further
analyzed using the Tukey–Kramer test. All of the statistical tests were
two-sided, and a probability value <0.05 was required for
statistical significance. All of the statistical analysis was performed
using SPSS 20.0 software.